US7633446B2 - Antenna apparatus and mobile communication device using the same - Google Patents

Antenna apparatus and mobile communication device using the same Download PDF

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Publication number
US7633446B2
US7633446B2 US11/424,041 US42404106A US7633446B2 US 7633446 B2 US7633446 B2 US 7633446B2 US 42404106 A US42404106 A US 42404106A US 7633446 B2 US7633446 B2 US 7633446B2
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Prior art keywords
antenna unit
antenna
conductor
distance
antenna apparatus
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US11/424,041
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US20070194995A1 (en
Inventor
Shyh-Tirng Fang
Meng-Hann Shieh
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MediaTek Inc
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MediaTek Inc
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Assigned to MEDIATEK INC. reassignment MEDIATEK INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FANG, SHYH-TIRNG, SHIEH, MENG-HANN
Priority to US11/424,041 priority Critical patent/US7633446B2/en
Priority to TW095143532A priority patent/TWI320612B/zh
Priority to CN2006101656649A priority patent/CN101026262B/zh
Priority to DE102006058934A priority patent/DE102006058934A1/de
Priority to RU2007106008/07A priority patent/RU2497246C2/ru
Priority to MX2007002143A priority patent/MX2007002143A/es
Priority to BRPI0700451-6A priority patent/BRPI0700451B1/pt
Priority to ARP070100760A priority patent/AR059877A1/es
Publication of US20070194995A1 publication Critical patent/US20070194995A1/en
Publication of US7633446B2 publication Critical patent/US7633446B2/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Definitions

  • the invention relates to an antenna apparatus using an antenna unit with length shorter than 1 ⁇ 4 the transmission or reception wavelength, and a mobile communication device using the same.
  • Design goals for personal mobile communication devices or wireless terminal equipment focus on light weight, thinness, compact profile and good communication quality.
  • Mobile phones for example, feature small streamlined models with multiple functions and applications, and low cost.
  • Wireless communication equipment requires more than one antenna such that multiple communication systems can be integrated and applied. Hence, it becomes a design issue and a critical problem to arrange the antennas in the wireless communication equipment and determine dimensions of antennas.
  • GSM systems of 850/900/1800/1900 MHz, WCDMA or CDMA2000 system, Bluetooth system and wireless LAN of 2400 or 5200/5800 MHz may be integrated into a single mobile phone, requiring more than 3 antennas.
  • GSM, WCDMA, CDMA2000, Bluetooth and wireless LAN systems all operate in the frequency band above 1 GHz, such that necessary antennas can be configured in the mobile phone with great effort by designing the antennas based on 1 ⁇ 4 wavelength antenna.
  • FM radio systems operate in the frequency range of about 88 ⁇ 108 MHz within VHF band. External earphones are required to serve as antennas for reception thereof, when providing FM radio systems in mobile phones. However, it is inconvenient for users to prepare earphones to listen FM radio.
  • FIG. 1 shows equivalent circuit diagram of an antenna apparatus with length shorter than 1 ⁇ 4 the operating wavelength, disclosed by U.S. Pat. No. 6,970,140.
  • the antenna apparatus 100 comprises an antenna unit 11 , a resistor 12 and a matching circuit 13 , connected in series in this sequence.
  • real part of input impedance (i.e., input resistance) of the antenna unit 11 is very small and less than real part of input impedance of a circuit unit 14 .
  • impedance matching using only the matching circuit 13
  • U.S. Pat. No. 6,970,140 further discloses coupling the resistor 12 between the antenna unit 11 and the matching circuit 13 .
  • the resistor 12 consumes considerable energy transmitted between the antenna unit 11 and the circuit 14 , degrading communication performance.
  • the antenna apparatus having an antenna unit with length shorter than 1 ⁇ 4 the operating wavelength of the antenna apparatus.
  • the antenna unit on a first plane can be arranged to set a first distance or a first angle with respect to a ground plane of the antenna apparatus, thereby improving impedance matching between the antenna unit and a communication module coupled thereto, and increasing radiation efficiency thereof. Consequently, the antenna apparatus can be applied to mobile communication devices without affecting appearance or cost.
  • an antenna apparatus applicable for a wireless device operated in a frequency band comprises an antenna unit comprising a first conductor, having a first end for feeding signals and a second end, and a ground plane providing a ground reference to the signals.
  • the first conductor and the ground plane have a first distance or an angle, and the first distance or the angle is adjustable to improve impedance matching of the antenna apparatus.
  • an antenna apparatus applicable for a wireless device operated in a frequency band wherein the wireless device has a circuit module and a ground plane.
  • the antenna apparatus comprises an antenna unit comprising a first conductor having a first end for feeding signals and a second end; and a reactive device, coupled to the first end and the circuit module, for feeding signals from the circuit module to the first end of the first conductor, wherein the reactive device having inductive components or capacitive components.
  • the first conductor and the ground plane have a first distance or an angle
  • the antenna unit has an input impedance having a real part and an imaginary part, the real part of the input impedance is adjustable by changing the first distance or the angle and the imaginary part of the input impedance is adjustable by tuning the reactive device.
  • length of the first conductor of the antenna unit is shorter than 1 ⁇ 4 the operating wavelength of the antenna apparatus, and the area of the first conductor is less than 1/64 the square of the operating wavelength of the antenna apparatus.
  • FIG. 1 is an equivalent circuit diagram of an antenna apparatus disclosed in U.S. Pat. No. 6,970,140.
  • FIGS. 2A and 2B schematically show mobile phones with antenna apparatuses of the present invention.
  • FIG. 3 schematically shows an antenna apparatus according to the invention.
  • FIGS. 4A and 4B schematically show arrangements of the antenna unit 31 and the ground plane 32 , in cross section along line B-B′ in FIG. 3 .
  • FIG. 5 is an equivalent circuit diagram of the antenna apparatus according to the invention.
  • FIGS. 6A , 6 B and 6 C show three exemplary embodiments of the antenna unit 600 with inductive structure.
  • FIG. 7 schematically shows another antenna apparatus 700 according to the invention.
  • FIG. 8 shows a smith chart of input impedance of antenna unit with length shorter than 1 ⁇ 4 operating wavelength.
  • FIG. 9 shows a smith chart of input impedance of an antenna unit with length of 400 mm (shorter than 1 ⁇ 4 operating wavelength) according to one embodiment of the invention.
  • FIG. 10 shows a smith chart of input impedance of an antenna unit with length of 400 mm (shorter than 1 ⁇ 4 operating wavelength) according to another embodiment of the invention.
  • FIG. 11 shows a smith chart of input impedance of an antenna unit with length of 400 mm (shorter than 1 ⁇ 4 operating wavelength) according to yet another embodiment the invention.
  • FIG. 12 shows a smith chart of input impedance of an antenna unit with length of 450 mm (shorter than 1 ⁇ 4 operating wavelength) according to a preferred embodiment of the invention.
  • FIG. 13 shows a chart of return loss (S 11 ) of the antenna unit corresponding to FIG. 11 .
  • FIG. 14 shows the relationship between the first distance D and some characteristics of an antenna apparatus according to the invention.
  • FIG. 15 shows the second distance dd and the second angle ⁇ between the second plane 154 and the ground plane 32 .
  • the antenna for low frequency system such as HF, VHF or UHF system
  • HF, VHF or UHF system is too large to be configured into mobile phones when using conventional 1 ⁇ 4 wavelength antenna, and therefore the invention provides an small antenna apparatus to overcome this problem.
  • the present invention provides an antenna apparatus with length shorter than 1 ⁇ 4 operating wavelength, which may be easily applied to mobile phones or any wireless devices.
  • the antenna apparatus of the present invention is designated for receiving and transmitting low frequency signals, such as signals with frequency under 1 GHz, like FM/AM signals.
  • low frequency signals such as signals with frequency under 1 GHz, like FM/AM signals.
  • mobile phones are used here as examples of mobile communication devices to describe the invention. Applications of the invention however should not be limited to mobile phones. Any wireless devices should be covered by the claimed invention.
  • FIGS. 2A and 2B schematically show mobile phones with the antenna apparatuses of the present invention .
  • the mobile phone 200 comprises a front housing 21 , a rear housing 22 , an main antenna 23 which may be an exposed or embedded antenna and an antenna apparatus 27 arranged inside the mobile phone 200 .
  • the main antenna 23 is an exposed antenna configured outside the mobile phone 100 .
  • the main antenna 23 is for receiving and transmitting high frequency signals via GSM, GPRS, EDGE, WCDMA, CDMA2000, Bluetooth and wireless LAN communication network, and the antenna apparatus 27 on the other hand is designated to receive and transmit low frequency signals, such as signals with frequency under 1 GHz, like FM/AM signals.
  • the mobile phone 200 further comprises a first circuit unit 25 , having at least a radio frequency (RF) module and a base band (BB) module, coupled to the main antenna 23 , a second circuit unit 26 , having a FM/AM radio circuit module, coupled to the antenna apparatus 27 , and a main circuit board 24 having the first and second circuit units provided thereon.
  • the main circuit board 24 is a PCB board.
  • the first circuit unit 25 enables communication between the mobile phone 200 and the base station, providing at least one of GSM, GPRS, EDGE, WCDMA, CDMA2000, Bluetooth and wireless LAN systems, etc. for users, and therefore the main antenna 23 operates in the frequency band around or above 1 GHz.
  • the second circuit unit 26 provides an additional wireless communication system, such as HF, VHF or UHF system operating in the frequency band below 1 GHz, to be integrated into the mobile phone 200 .
  • the HF, VHF or UHF system may be FM (Frequency Modulation) system, AM (Amplitude modulation) system, transceivers or DTV (Digital Television) system, etc.
  • the second circuit unit 26 is a FM module, as an example, and therefore the antenna apparatus 27 operates in the frequency band of 88 to 108 MHz.
  • the present invention provides an antenna apparatus 27 with length shorter than 1 ⁇ 4 operating wavelength which can be easily placed in either side of the mobile phone 200 .
  • FIG. 3 schematically shows an antenna apparatus 300 according to the invention.
  • the antenna apparatus 300 applicable for a wireless device, operated in a frequency band, for example, 88 to 108 MHz, comprises an antenna unit 31 with a first conductor 31 extending on a first plane 35 , having a first end 33 for feeding signals from/to a FM module, such as the second circuit unit 26 shown in FIG. 2A or 2 B, and a second end 36 ; and a ground plane 32 providing a ground reference to the signals.
  • the ground plane 32 can be configured in the main circuit board 24 when applied to the mobile phone 200 of FIG. 2A or 2 B, in this embodiment.
  • the length of the antenna unit 31 is shorter than 1 ⁇ 4 the operating wavelength of FM radio band (or 1 ⁇ 4 operating wavelength of the antenna unit).
  • the antenna apparatus 300 can further comprise a reactance device 34 coupled between the antenna unit 31 and the FM module (second circuit unit) for impedance matching of the antenna apparatus 300 .
  • the reactance device 34 may include only inductive and/or capacitive components. In some embodiments, it may further include resistors. The design of the reactance device 34 is not limited in the present invention.
  • FIGS. 4A and 4B schematically show arrangements of the antenna unit 31 and the ground plane 32 , between cross section B-B′ in FIG. 3 .
  • the antenna unit 31 is arranged to set a first distance D and a first angle ⁇ between the first plane 35 (on which the antenna unit 31 is configured, as depicted in FIG. 3 ) and the ground plane 32 configured on the main circuit board 24 .
  • the antenna unit 31 has real part and imaginary part of input impedance.
  • the real part of input impedance of the antenna unit 31 can be tuned by adjusting the first distance D or the first angle ⁇ .
  • the first angle is set between 0 to 90 degrees.
  • the first distance and first angle in FIG. 4B can be set as D 1 and ⁇ 1 to adjust the real part of input impedance of the antenna unit 31 .
  • FIG. 5 shows equivalent circuit diagram of an antenna apparatus 500 according to the invention.
  • the antenna unit 51 of the antenna apparatus 500 shorter than 1 ⁇ 4 the operating wavelength is coupled to a circuit unit 53 (FM module, for example) through a reactance device 52 , including at least an inductive device or capacitive device.
  • the real part of input impedance of the antenna unit 51 can be tuned by setting the first distance D and the first angle ⁇ , thereby achieving impedance matching to the real part of input impedance of the circuit unit. Consequently, additional resistor (as shown in FIG. 1 ) is not required between the antenna unit 52 and the circuit unit 53 .
  • the antenna unit of the antenna apparatus may have inductive structure to improve imaginary part of input impedance of the antenna unit.
  • FIGS. 6A , 6 B and 6 C show three exemplary embodiments of the antenna unit 600 with inductive structure.
  • FIG. 6A or 6 B shows the antenna unit 600 , comprising a conductor 63 , having meander line pattern
  • FIG. 6C shows the conductor of the antenna unit has a spiral pattern. All antenna units shown in FIGS. 6A to 6C are reactance devices. Input reactance (imaginary part of input impedance) of an antenna unit (one end open as depicted in FIGS.
  • antenna area the area of the conductor 63 (hereinafter referred to as antenna area), depicted as the regions 61 and 62 , is less than 1/64 square of operating wavelength of the antenna unit 600 .
  • the extending conductor of the antenna unit can be formed by a metal line, metal sheet or a metal trace printed on a supporting member.
  • the support member can be a circuit board, with one or multiple layers, with the metal trace printed on at least one layer of the circuit board.
  • FIG. 7 schematically shows another antenna apparatus 700 according to the invention.
  • a second end 76 of the antenna unit 31 is coupled to the ground plane 32 .
  • Input reactance (imaginary part of input impedance) of the antenna unit 71 with length shorter than 1 ⁇ 4 the operating wavelength is positive and inductive. Therefore, capacitive devices (capacitors) can be used to match the impedance between the antenna unit and a circuit unit 72 .
  • the preferred first distance D to be set is shorter than or equal to 15 mm for impedance matching, when operating in the band of about 88 to 108 MHz.
  • the shorter the first distance D the less the real part of input impedance of the antenna unit, according to the invention.
  • the first distance D is reduced to 10 mm or less to improve impedance matching of the antenna apparatus.
  • the first distance D can be further reduced to within 2 to 8 mm to improve real part of input impedance of the antenna unit up to 40 to 60 ohms.
  • the first distance D may be shorter than 2 mm when considering a trade-off between impedance matching and internal arrangement of slim and compact mobile phone.
  • each Smith chart illustrates an impedance characteristic of the antenna of the present invention between the FM frequency of 88 MHz to 108 MHz.
  • Each Smith chart is normalized and the circle in the chart in which the points ⁇ 1 and ⁇ 2 exist is the locus of the characteristic impedance. It should be noted that the frequency range between 88 MHz to 108 MHz is only an example, not a limitation to the present invention.
  • FIG. 8 shows a smith chart of input impedance of an antenna unit with length shorter than 1 ⁇ 4 the operating wavelength.
  • the antenna unit with one end opened, operates within the range of 88 to 108 MHz and has negative input reactance.
  • the input impedances of the antenna unit indicated by ⁇ 1 and ⁇ 2 are about 95.61-j834 and 44.62-j710.2 respectively.
  • the points ⁇ 1 and ⁇ 2 are too far away from the center of the smith chart which is the perfect matching point, meaning that the impedances at the points ⁇ 1 and ⁇ 2 are not perfectly matched and most signal power are of a great loss.
  • FIG. 9 shows a smith chart of input impedance of an antenna unit with length of 400 mm (shorter than 1 ⁇ 4 operating wavelength) according to the invention.
  • the antenna unit with one end open, operates within the range of 88 to 108 MHz, and an inductive reactance device with inductance of 390 nH is used for impedance matching.
  • the first distance D and first angle ⁇ are set to 2 mm and 70 degrees.
  • the input impedances (respectively measured at 88 and 108 MHz) of the antenna unit indicated by ⁇ 1 and ⁇ 2 are about 147.3-j557.1 and 74.1-j367.4 respectively.
  • FIG. 10 shows a smith chart of input impedance of another antenna unit with length of 400 mm (shorter than 1 ⁇ 4 operating wavelength) according to the invention.
  • the only different test condition is that the first distance D in this is set to 0.5 mm.
  • Other test conditions are the same as described in FIG. 9 .
  • the input impedances (respectively measured at 88 and 108 MHz) of the antenna unit indicated by ⁇ 1 and ⁇ 2 are about 102.8-j462.7 and 60.83-j253.1 respectively.
  • FIG. 11 shows a smith chart of input impedance of another antenna unit with length of 400 mm (shorter than 1 ⁇ 4 operating wavelength) according to the invention.
  • the only different test condition is that the first distance D in this is set to 5 mm.
  • Other test conditions are the same as described in FIG. 9 .
  • the input impedances (respectively measured at 88 and 108 MHz) of the antenna unit indicated by ⁇ 1 and ⁇ 2 are about 240.4-j755.4 and 118.9-j608.8 respectively.
  • FIG. 12 shows a smith chart of input impedance of a preferred antenna unit with length of 450 mm (shorter than 1 ⁇ 4 operating wavelength) according to the invention.
  • the antenna unit with one end open, operates within the range of 88 to 108 MHz.
  • an inductive reactance device with inductance of 680 nH is used for impedance matching.
  • the first distance D and first angle ⁇ are set to 1.5 mm and 90 degrees.
  • the input impedances (respectively measured at 88 and 108 MHz) of the antenna unit indicated by ⁇ 1 and ⁇ 2 are about 72.07-j179.9 and 82.41-j179.8 respectively.
  • the real part of input impedance of the antenna unit is closer to the desired resistance 50 ohms (i.e., it is closer to the center of the Smith chart or the normalized impedance of 1).
  • FIG. 13 shows a chart of return loss (S 11 ) of the antenna unit corresponding to FIG. 12 .
  • S 11 return loss
  • FIG. 14 shows the relationship between the first distance D and characteristics of an antenna apparatus according to the invention.
  • the antenna unit of the antenna apparatus is arranged with a first angle ⁇ of 90 degrees and a first distance D with respect to a ground plane of the antenna apparatus, and the central frequency of the antenna apparatus changes in the frequency range of 90 to 120 MHz.
  • Curve 142 of FIG. 14 shows that the shorter the first distance D, the less the impedance of the antenna unit.
  • Curve 144 of FIG. 14 shows that the shorter the first distance D, the lower the central frequency (with the least return loss). Therefore, not only the impedance but also the central frequency can be tuned by setting the first distance D and the first angle ⁇ .
  • the antenna apparatus of the invention can be easily designed to have length shorter than 1 ⁇ 4 operating wavelength by setting a specific distance and angle between an antenna unit and a ground plane thereof, appropriate for applications of HF, VHF and UHF systems with operating frequency lower than 1 GHz.
  • the antenna unit 150 can further comprises a second conductor 151 extending from the second end on a second plane 154 different from the first plane 35 , for tuning real part of input impedance of the antenna unit 31 by adjusting a second distance dd and a second angle ⁇ between the second plane 154 and the ground plane 32 .
  • the first ⁇ is 0 degree
  • advanced tuning can be accomplished by setting the second distance dd and second angle ⁇ .
  • the second conductor has the same characteristics as described in FIGS. 6A to 6C .

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Support Of Aerials (AREA)
  • Details Of Aerials (AREA)
  • Transceivers (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
US11/424,041 2006-02-22 2006-06-14 Antenna apparatus and mobile communication device using the same Active 2028-05-23 US7633446B2 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US11/424,041 US7633446B2 (en) 2006-02-22 2006-06-14 Antenna apparatus and mobile communication device using the same
TW095143532A TWI320612B (en) 2006-02-22 2006-11-24 Antenna apparatus appliable for a wireless device operated in a frequency band
CN2006101656649A CN101026262B (zh) 2006-02-22 2006-12-11 适用操作于一频段的无线装置的天线装置
DE102006058934A DE102006058934A1 (de) 2006-02-22 2006-12-12 Antennenvorrichtung und mobile Datenübertragungseinrichtung, welche diese verwendet
RU2007106008/07A RU2497246C2 (ru) 2006-02-22 2007-02-19 Антенное устройство и использующее его мобильное устройство связи
MX2007002143A MX2007002143A (es) 2006-02-22 2007-02-21 Aparato de antena y dispositivo de comunicaciones moviles que lo utiliza.
BRPI0700451-6A BRPI0700451B1 (pt) 2006-02-22 2007-02-22 Aparelho e unidade de antena aplicáveis a um dispositivo sem fio em uma banda de frequência
ARP070100760A AR059877A1 (es) 2006-02-22 2007-02-22 Aparato de antena y dispositivo de comunicaciones moviles que lo utiliza

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US77557506P 2006-02-22 2006-02-22
US78000706P 2006-03-07 2006-03-07
US11/424,041 US7633446B2 (en) 2006-02-22 2006-06-14 Antenna apparatus and mobile communication device using the same

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US20070194995A1 US20070194995A1 (en) 2007-08-23
US7633446B2 true US7633446B2 (en) 2009-12-15

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US (1) US7633446B2 (zh)
CN (1) CN101026262B (zh)
AR (1) AR059877A1 (zh)
BR (1) BRPI0700451B1 (zh)
DE (1) DE102006058934A1 (zh)
MX (1) MX2007002143A (zh)
TW (1) TWI320612B (zh)

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US20100149051A1 (en) * 2008-12-15 2010-06-17 Samsung Electronics Co. Ltd. Antenna device for portable wireless terminal
US20170353781A1 (en) * 2016-06-01 2017-12-07 Lg Electronics Inc. Wearable sound equipment

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US7755547B2 (en) * 2006-06-30 2010-07-13 Nokia Corporation Mechanically tunable antenna for communication devices
JP4692635B2 (ja) * 2006-12-04 2011-06-01 パナソニック株式会社 アンテナ装置と、これを用いた電子機器
WO2010015364A2 (en) 2008-08-04 2010-02-11 Fractus, S.A. Antennaless wireless device capable of operation in multiple frequency regions
WO2010116373A1 (en) * 2009-04-07 2010-10-14 Galtronics Corporation Ltd. Distributed coupling antenna
WO2011072740A1 (en) * 2009-12-17 2011-06-23 Laird Technologies Ab Antenna arrangement and portable radio communication device therefore
US9071335B2 (en) * 2011-07-08 2015-06-30 Skyworks Solutions, Inc. Radio-frequency modules having tuned shielding-wirebonds
US9088069B2 (en) * 2011-09-21 2015-07-21 Sony Corporation Wireless communication apparatus
CN109309504A (zh) * 2017-07-28 2019-02-05 西安中兴新软件有限责任公司 一种天线匹配的方法和终端
WO2020154695A1 (en) 2019-01-24 2020-07-30 Wispry, Inc. Method for integrating antennas fabricated using planar processes

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US20170353781A1 (en) * 2016-06-01 2017-12-07 Lg Electronics Inc. Wearable sound equipment
US10341755B2 (en) * 2016-06-01 2019-07-02 Lg Electronics Inc. Wearable sound equipment

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BRPI0700451A (pt) 2007-11-06
CN101026262B (zh) 2011-08-17
TWI320612B (en) 2010-02-11
AR059877A1 (es) 2008-05-07
CN101026262A (zh) 2007-08-29
TW200733484A (en) 2007-09-01
MX2007002143A (es) 2008-11-18
DE102006058934A1 (de) 2007-08-30
US20070194995A1 (en) 2007-08-23
BRPI0700451B1 (pt) 2019-09-17

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